Fluid transfer pump



June 26, 1951 T. D. NlsBET 2,558,312

FLUID TRANSFER PUMP Filed April 27, 1946 INVENTOR. TM D. )11416.66

C7- .1 BY

container.

UN I TED sTATesA-f l TE N T ,"OFFllC-E FLUID TRANSFER PUMP Thomas D. Nisbet, Rocky River, Ohio Application April 27, 1946, SerialNo.` 665,577

My invention relates in general to fluid pumps,

andin particular, to that type of pump known `asa barrel dispensing pump for use at intermittent times in transferring liquid in small :amounts from a large container to Aa smaller One ofthe objects of my invention is the provision'of a fluid pump which is economical to manufacture and which will readily transfer fluid from a largeoontainer into a small con Vtainer Another object of my invention is the provision "of 'a `fluid pump in which all the working parts are `enclosed within the pump, thus making it suitable for intermittent Vout-of-doors use.

u Another object of my invention is the provision d `of a fluid pump in which the packing about the lever which 'extends from the pump housing and which actuates the pump mechanism within'the pump is not exposed to huid pressure.

Another object of my invention is the provision of a pump in which the travel of the piston isgoverned by stops on the inside of the hous- "in'gagainst which the actuating arm bumps.

lAnother object of my invention is the provision i 'of auid pump in which the piston and piston 'rod have universal connection means.

`Another object of my invention is the provision of a fluid pump in `which the connection between Athe piston rod and the piston forms a valve for t0n Y `Another object of my invention is the provision of a fluid pump in which `the piston is self-aligning with the cylinder.

` Another object of my invention is the provision of a fluid pump with a piston therein which has sealing rings and a cylindrical ring about the piston.

Another object of my invention is an oscillating movement wherein all of the operating mechanism is 4self-contained` within a cylinder taken in combination with a stuffing box which is never `subjected to pressure of the liquid. being pumped.

,Y Another object of my invention is the provision of a universal connection between a piston and a controlling the passage of liquid through the pis- 1;'

tain'e'r IU. Theballoheckvalve 2l Other objects and a fuller understanding of lowing descriptio'n and claims, taken in conjunction with the accompanying drawing, in which:

Figure 1 of my drawings is a cross-sectional view illustrating my preferred fluid pump;

Figure 2 is a'plan View of my piston taken'along the lines 2-2 of Figure 1, certain parts being omitted for clarity;

Figure 3 is a fragmentary View of the piston assembly in a downward stroke; and u Figure e is a cross-sectional view taken along the lined- 4 of Figure 1.

One of the uses of a pump of this type is where a speedydeliv'ery is not necessary and where no measurement of the fluid or liquid being pumped is required. The main commercial use of the pump is to transfer mainly inflammable liquids from a barrel or an original shipping container into a measure or other smaller vessel. Pumps of this general class or type are often referred to as barrel pumps.

With particular reference to the drawings, the referenee character Il] represents a fluid container from which fluid or liquid such Vas gasoline, naphtha, or other similar liquids are to be pumped. As shown in Figure 1, my pump, which is indicated by the reference charatcer II, is connected directly to the top of the container I0 and is adapted to be actuated by a manuallyoperable lever 36 which is moved up and down toprod'uce the pumping operation.

My pump comprises an intake housing I 2, a discharge housing I3, and a cylinder I4 mounted therebetween. The discharge housing I3 and the intake housing I2 have threaded means into which the ends of theA cylinder I/i are threaded to hold the cylinder I4 therebetween. A good Asealing "engagement is obtained between the cylinders and the intake housing I2 and thedischarge housing I3 by threading the cylinder into the `housings.V A discharge conduit i5 may be threadably connected tothe discharge `housing I 3, and as the pump is operated, the fluid which is `being pumped is` discharged out through the discharge conduit I5 into another vesselor container. An intake conduit I6 may be threadablyconnected to the bottom of the intake housing l2, and when the pump is in 'operation the intake conduit I6 extends down into the container VIEI for conveying liquid ,to the intake housing l2. f A ball check valve?! placed immediately in the intake housing I2 above the intake conduit i6 prevents the return of the flow of "fluid Vor liquid to the conmay betermed Yabout the cylindrical flanges 35 and 32.

astenia f 3 a one-way valve and seats itself to prevent the ow of liquid or fluid back from the pump into the chamber I0.

The lower end of the intake housing l2 is provided with two stepped threaded portions l1 and I8, whereby my pump may accommodate thread openings in the container l of different sizes. Original shipped or delivery containers, or drums. as now found on the market, have two sizes of threaded openings, and thus if my pump is to be connected to a container having a small opening, then the threaded portion I8 is employed, and in the event that the container has a large opening, then thethreaded portion I1 is employed to connect my pump ll to the top of the liquid container l0.

Mounted inside my cylinder i4 is a piston 24. This piston 24 is constructed from a top cupshaped plate 25 and a bottom cup-shaped plate 23. Each of these plates 25 and 2B have a center opening 21 therein through which piston rod 28 extends. As is best illustrated in Figure 2, the top cup-shaped plate 25 has a bottom portion 25 with the side or cylindrical flange portion 35 thereabout. The bottom plate 25 has a bottom portion 3l with a cylindrical flange 32 thereabout. Radial end anges 59 extend The bottom portions 29 and 3| have raised bosses 33V and 34, whereby the top and bottom plates may be fastened together with a space '40 therebetween. The bosses 33 on the top plate and 34 on the bottom plate separate the bottom portions 25 and 3| when the cup-shaped plates are put back to back. The plates may be fastened together by spot welding these bosses 33 and 34 together. The top plate 25 has openings 35 in the bottom portion 3| between these bosses 33. A plan view of the top plate, to better illustrate the preferred arrangement of these bosses 33 and openings 35 therebetween, is best illustrated in Figure 2 of my drawings.

Double sealing rings are used in the piston. Since this is the most vulnerable part of any pump, the double sealing rings insure longer life because the pump will function successfully even though one ring becomes damaged or broken. It is understood that I do not intend to limit my invention to a piston with which double sealing rings are used, but am using this to better describe the preferred design of my pump. VThe double sealing rings comprise an expansion ring 31 and an expansion ring 38 with a cylindrical ,ring 33 therebetween. The expansion rings 31 and 38 engage the wall of the cylinder I4, and the cylindrical ring 39 between the expansion Vrings 31 and 38 engages the cylindrical iianges 35 and 32 of the piston 24. The position of these rings 31, 38 and 35 is best illustrated in Figures l and 3 of my drawings.

In constructing the piston 24 the cylindrical ring 39 may be used as a jig for aligning the piston plates 25 and 26. The cylindrical ring has an inside diameter substantially the same as the outside diameter of the cylindrical ilanges 35 and 32 to provide a slip fit therebetween. The top plate 25 may be slipped into one side of the cylindrical ring 35, and the bottom plate 25 slipped into the other side of the cylindrical ring 39. This cylindrical ring 35 may be constructed from a section of pipe, or it may be made of flat stock rolled into the desired shape.

After the plates 25 and 26 have been inserted bosses 33 and 34, these plates may be welded together at the point of engagement of the bosses to form the piston 25. The cylindrical ring 39 aligns the top plate 25 with the bottom plate 26 and extends about the space 4U between the bottom portions 3l and 25 of the plates 25 and 25. The cylindrical ring 35 has a width greater than the distance between the bottom portions 29 and 3l of the plates 25 and 25 which form the piston 2li. Lubrication about the cylindrical ring 39 may be obtained from the fluid or liquid flowing through the space lill between the'plates of the piston. The expansion rings 31 and 38, one on each side of the cylindrical ring 39, may be any suitable split piston ring which normally expands outwardly against the cylinder wall about the piston. These piston rings 31 and 33 may be inserted about the piston and one on either side of the cylindrical ring 39 as the piston is inserted in the cylinder I4. The expansion rings 31 and 38, whilegengaging vthe cylinder wall of the cylinder i5, also t between the side edges 5i of the cylindrical ring 39 and the radial end anges 59 of the top and bottom plates 25 and 25. The combination of these rings 31 and 38 along with the cylindrical ring 35 seal the space 43 between the top plate .25 and the bottom piate 25 and also seal between the piston and the cylinder wall, Y

The piston rod 23, which extends through the center opening 2 in the piston 24 and is univer-sally connected thereto, may be preferably constructed from a rod. The piston rod 28 has a shoulder 55 with a threaded extended portion 55 on the end thereof which extends through the piston 25. The threaded extended portion 45 has a smaller diameter than the main body portion 4l of the piston rod 28. The other end of the piston rod 28 has a at portion 48 with an opening therethrough to provide means for hingedly fastening an actuating arm 55 thereto.

A bottom valve member 53 and atop member 53, spaced by a spacer 55, extend about the threaded extended portion 45 of the piston rod 28 and are held thereon by a nut 56. rIhe bot,

tom valve member 55 has a at surface 51 on one side thereof which abuts against the shoulder 45 and. a curved surface 58 which engages the center opening 21 in the bottom plate 26. rihe edge of the opening 21 in the bottom plate forms a valve seat, against which the curved surface 53 of the bottom valve member53 seats itself to close the valve. This bottom valve member 53 preferably has a spherical surface and may be constructed from a ball or small sphere. When the bottom valve member 53 engages the bottom plate 26, while the piston is moving upward or toward the discharge housing i3, the valve. is

closed.

Similarly, the top member 54 may be constructed from a spherical segment or from a bail and is disposed to engage about the center opening in the top plate 25 when the piston is being moved downward. The spacer 55, between the bottom valve member 53 and. the top member 54, has a length suicient to prevent engagement of the bottom valve member 53 with the bottom plate 25 while the top member 54 is in engage.- ment with the top plate 25. Although I have shown the top member 55 to .be a spherical segment, and preferably designed it such for construction from the sphere or ball from which the bottom valve member 53 is constructedit is understood that other suitable shaped members may be employed.

faasegsra To rec'iprocally move the piston 24 in thelupward and downward strokes within the cylinder I4, I use the lever arm 35 which has a shaft por- -tion i extending within the intake housing I2.

As is shown in my drawings, the shaft portion 6I is at an angle to the lever 3S, whereby it will be partially oscillated when the lever is moved up and down. The shaft portion @I has non-circular shape and carries the shaft end 5l of the actuating arm 5t which actuates the piston rod 23. The shaft end 5l oi the actuating arm 5i] has a noncircular opening therein to cooperate with the shaft portion 6I, whereby when the lever 3b is manually moved up and down, the actuating arm 50 is hingedly connected by means oi a pin 52 to the piston rod flattened portion 33. The ac tuating arm E!! may be constructed from two dat strips of metal which may be spot welded together or joined by other suitable means. The two at strips of metal are separated on the piston end 52 with the strips of metal extending on opposite sides of the flat portion 48 of the piston rod 2B.

A stop 553 and a stop t4, on the inside of the intake housing i2, limit the oscillating movement of the actuating arm to control the lengih of the piston stroke in either direction. These stops S3 and Sli may be cast as a part of the intake housing I2. When the lever 36 is moved down to move the piston 24 up, the actuating arm 50 bumps against the stop B3 `to prevent further movement of the piston in the upward direction. When the lever is moved upward to move the actuating arm, and thereby the piston, in the downward direction toward the intake housing, the actuating arm 5U bumps against the stop 64 to prevent further movement of the piston in the downward direction. The piston travel or stroke in either direction is thus controlled by means which cannot result in any damage to the piston or piston rod.

To prevent escape of liquid or iluid about the shaft portion BI of the lever it where it enters the lever support portion 6l of the intake housing I2, I have employed a packing nut 55, and packing or stuing 66, This packing or stuffing B6 may be of any suitable material which may readily compress about the shaft portion 6I' when the packing nut 65 is tightened into the lever support portion ii'l of the intake housing I2. By eX- tending the lever 35 into the intake housing I2 and fastening the actuating arm to it on the intake side of the piston, I have provided a stuffing box about the lever which is never subjected to the pressure of the liquid or rlud being pumped. Stuffing or packing, when not subjected to the high pressure of the liquid or fluid being pumped, will form a fluid-tight seal about the lever for a much longer period of time.

Washers 69 may be inserted, one on each side of the actuating arm 50 and on the shaft portion 6i of the lever arm 3S to prevent play in the movement of the actuating arm 5B. These washers G9 and the actuating arm 5I! may be assembled onto the shaft portion iiI as it is being inserted into the lever support portion 6i of the intake housing i2. Inside shoulders 'Iii of the lever support portion 61 are substantially parallel to the plane of movement of the actuating arm 5D. The washers Se, placed between the actuating arm 5t and the shoulders l, prevent sidewise movement between the actuating arm and the shaft portion Ii I.

Figure l of my drawing illustrates the position of the piston at the top of a stroke. In the upward stroke, the piston 24 has pulled fluid or liquidthrough the intake conduit land into the intake housing I2 and the cylinder I4 This liquid is prevented from moving back into the container I0 by the ball check valve 2l inthe intake housing I2. The lever 36 is then moved upward to pull the piston 24 downward or toward the intake housing I2. The connection between the piston rod 2B and the piston 24 while the piston rod 23 is pulling the piston 24 in this downward direction, is best illustrated by Figure 3 of my drawing. The top member 54 engages the top plate 25 of the piston 24 and about the center opening 2l to form a connection means between the piston 2d and the piston rod 28 whereby the piston rod pulls the piston downward. The bottom valve memberS is away from the valve seat about the opening 2i inthe bottom plate 26. Fluid in the bottom of the cylinder andin the intake housing I2 passes through the opening 2'I in the bott-om plate 26 through the space4ll between the plates 2e and 26 and through the openings 35 in the top plate 25. When the piston has reached the bottom of the stroke, the actuating arm 5t bumps against the stop 64 to prevent further movement in the downward direction toward the intake housing. The liquid or fluid which was below the piston or on the intake side, has now passed through the piston and is on the discharge side of the piston.

When the lever handle is pushed down, the piston rod moves the piston upward or toward the discharge housing i3 to force the liquid or huid on that the piston out of the pump and at the sam-c .f me to pull more liquid through the intake conduit into the pump. The bottom valve member on the piston rod 23 engages the bottom plate of 'the piston 24 and seats itself about the opening 2l to form a closed valve while the piston is being moved upward and toward the discharge housing I3. This bottom valve member thus serves the dual pur-- pose of providinT a ball universal connection between the p'mton and the piston rod and also as a ball-type valve which laps its own seat with each stroke of the piston. Since the bottoni valve member 53 againstthe edge oi the center openingv 2l in the bottom of the piston, it closes the valve to prevent passage of fluid or liquid through the piston. Thus as the piston is raised or moved in the upward direction it forces liquid outward through the discharge conduit I5 under a pressure and at the same time pulls more liquid or iuid through the intake conduit I6 into the pump.

I have provided for what may be termed a floating piston by universally connecting the piston rod to the piston at substantially the geometrical center or" the piston. The power to the piston is applied at substantially this geo- .metrical center of the piston. The universal connection between the piston rod and the piston prevents unnecessary sidewise forces between the piston and the cylinder'. With this universal connection substantially at the geometrical cenu ter of the piston, the piston rod may swing with respect to the piston in any direction and yet move the piston upward or downward in. the cylinder. The piston rings, backed up by the cylindrical anges about the piston prevent the piston from tipping as it is reciprocally moving in the cylinder.

Although I have described my invention `with a certain degree of-particularity in its preferred form, it is understood that the present disclosure of the preferred form has been made only by :way of example and that numerous changes in ythe details of construction and the combination and arrangementv of parts may be resorted to Ywithout departing from the spirit and the scope 'of the invention as hereinafter claimed. What is claimed is: 1. The combination of an improved swingable piston and an improved piston rod adapted to reciprocally move the piston in a rst and in a second direction in a pump cylinder, said piston comprising a nrst and a second plate each having an opening in the center thereof, means for fastening the plates together and for providing space therebetween through which uid may pass, said second plate having at least a second opening through which liuid may pass from the -space between said plates, said piston and said 'swingable piston rod having universal and swing- ,able connection means including a valve with a valve seat donned by the ,center openingl in the rst plate and a valve member universally seatable therein, said valve member seating in said :valve seat to close the valve and prevent uid passing therethrough into the space between the -plates while the piston rod moves the piston in the first direction, said valve member moving from the valve seat to open the valve and permit fluid to pass therethrough into the space between the plates while the piston rod moves the piston in the second direction.

2. 1n a valved piston for a fluid pump, a first members constituting a valve member, each of said members having a substantially spherical surface with the spherical surface on one member facing the spherical surface on the other member, the spherical surface on said valve member being positioned to seat in the opening in the center of the first plate.

3. The combination of an improved piston -and an improved swingable piston rod adaptedV 'to reciprocally move the piston in a nrst and in a second direction in a pump cylinder, means for fasteningl the platesl together and for providing space therebetween through which fluid may pass, said first plate having an opening through which fluid may pass intoy the space between said plates, said second plate having aperture means through which fluid mayV pass from the space between said plates, said piston and said swingable piston rod having universal and sWingable connection means .to reciprocally move said piston insaid iii-st and second directions and including a valve with a Valve seat deiined by said opening in the first plate and a valve member universally seatable therein, said valve member seating in said valve seat to close the valve and prevent nuid passing therethrough into'the space between the plates while the piston 'rod vmoves the piston in the rst direction, said valve member moving from the valve seat to open Vthe valve and permit fluid to pass therethrough into the space between the plates while the piston rod moves the piston in the second direction.

1 THOMAS D. NlSBET.

REFERENCES CITED The following references are of record in the filev of this patent:

UNITED STATES PATENTS A 

